#include "netsendreceive.h"
#include <QtNetwork>
#include<QDebug>

NetSendReceive::NetSendReceive(QObject *parent) :
    QObject(parent)
{
    qRegisterMetaType<NetDataPacket>("NetDataPacket");

    udpSocketSend=new QUdpSocket(this);//
    udpSocketRecv= new QUdpSocket(this);
    //bool state=udpSocketRecv->bind(20000);//192.168.25.78,192.168.2.230, QUdpSocket::ShareAddress
    //qDebug()<<"udp bind state:"<<state;

    sendPacket.header1=NET_HEADER1;
    sendPacket.header2=NET_HEADER2;
    sendPacket.destAddressLength=NET_ADDRESS_LENGTH;
    sendPacket.destAddress=NET_ADDRESS_MS;
    sendPacket.sourceAddressLength=NET_ADDRESS_LENGTH;
    sendPacket.sourceAddress=NET_ADDRESS_LOCAL;
    sendPacket.tail1=NET_TAIL1;
    sendPacket.tail2=NET_TAIL2;

    /*
    recvPacket.header1=NET_HEADER1;
    recvPacket.header2=NET_HEADER2;
    recvPacket.destAddressLength=NET_ADDRESS_LENGTH;
    recvPacket.destAddress=NET_ADDRESS_LOCAL;
    recvPacket.sourceAddressLength=NET_ADDRESS_LENGTH;
    recvPacket.sourceAddress=NET_ADDRESS_MS;
    recvPacket.tail1=NET_TAIL1;
    recvPacket.tail2=NET_TAIL2;
    */
    connect(udpSocketRecv, SIGNAL(readyRead()),this, SLOT(ProcessPendingDatagrams()));

    SetSocket("192.168.2.230",20000,"192.168.2.240",30000);
    //SetSocket("127.0.0.1",20000,"127.0.0.1",20000);

}
void NetSendReceive::ReInit()
{

}
void NetSendReceive::SetSocket(QString localIp,int localPort,QString destIp,int destPort)
{
    this->destIp=destIp;
    this->destPort=destPort;

    this->localIp=localIp;
    this->localPort=localPort;

    bool state=udpSocketRecv->bind(localPort);//QHostAddress(localIp),

    qDebug()<<"udp bind state:"<<state;
    qDebug()<<"destIp"<<destIp<<destPort;
    qDebug()<<"localIp"<<localIp<<localPort;
}

bool NetSendReceive::SendData(QByteArray datagram)
{ 
    udpSocketSend->writeDatagram(datagram.data(), datagram.size(),
                                 QHostAddress(destIp), destPort);//QHostAddress::Broadcast

    qDebug()<<"wait recv...";
    if(udpSocketRecv->waitForReadyRead(TIMEOUT_SEND))
    {
       return ProcessPendingDatagrams();
    }
    else
    {
        qDebug()<<"recv fail";
    }

    return false;
}

//7d 7b 01 f5 01 f3 30 55 00 02 12 34 55 55 7d 7d
//00 01 02 03 04 05 06 07 08 09
bool NetSendReceive::SendData(NetDataPacket sendData,NetDataPacket &receiveData)
{
    QByteArray datagram;
    //datagram.resize(14);
    datagram.append(NET_HEADER1);
    datagram.append(NET_HEADER2);
    datagram.append(NET_ADDRESS_LENGTH);
    datagram.append(NET_ADDRESS_MS);
    datagram.append(NET_ADDRESS_LENGTH);
    datagram.append(NET_ADDRESS_LOCAL);
    datagram.append(sendData.cmd1);
    datagram.append(sendData.cmd2);
    datagram.append(sendData.length&0xff);
    datagram.append((sendData.length>>8)&0xff);
    datagram.append(sendData.data);
    sendData.cs=Crc(datagram.mid(2));//
    datagram.append(sendData.cs&0xff);
    datagram.append((sendData.cs>>8)&0xff);
    datagram.append(NET_TAIL1);
    datagram.append(NET_TAIL2);

    qDebug()<<"sendData.cmd1"<<QString::number(sendData.cmd1,16)
              <<"sendData.cmd2"<<QString::number(sendData.cmd2,16)
                <<"sendData.length"<<QString::number(sendData.length,16)
                  <<"sendData.cs"<<QString::number(sendData.cs,16)
                    <<"sendData.data"<<sendData.data.toHex();

    sendPacket.cmd1=sendData.cmd1;
    sendPacket.cmd2=sendData.cmd2;

    int size=udpSocketSend->writeDatagram(datagram.data(), datagram.size(),
                                 QHostAddress(destIp), destPort);//QHostAddress::Broadcast
    qDebug()<<"writeDatagram size"<<QString::number(size,16);

    /*
    qDebug()<<"wait recv...";
    if(udpSocketRecv->waitForReadyRead(TIMEOUT_SEND))//n*
    {
       return ReceiveData(receiveData);
    }
    else
    {
        qDebug()<<"recv fail";
    }
*/

    if(size==datagram.size())
    {
        return true;
    }
    return false;
}

bool NetSendReceive::ReceiveData(NetDataPacket &receiveData)
{
    int state;
    while (udpSocketRecv->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(udpSocketRecv->pendingDatagramSize());
        udpSocketRecv->readDatagram(datagram.data(), datagram.size());
        state=Check(datagram);
        if(state==true)
        {
           receiveData=recvPacket;
           qDebug()<<"receiveData.cmd1"<<receiveData.cmd1
                     <<"receiveData.cmd2"<<receiveData.cmd2
                       <<"receiveData.length"<<receiveData.length
                           <<"receiveData.data"<<receiveData.data.toHex()
                             <<"QThread::currentThreadId()"<<QThread::currentThreadId();
        }
    }
    return state;
}

bool NetSendReceive::ProcessPendingDatagrams()
{
    bool state;
    QByteArray datagram;
    datagram.resize(udpSocketRecv->pendingDatagramSize());
    udpSocketRecv->readDatagram(datagram.data(), datagram.size());
    //qDebug()<<"datagram.size()"<<datagram.size();
    state=Check(datagram);
    if(state==true)
    {
        emit SIG_ReceiveData(recvPacket);
    }
    return state;
}

bool NetSendReceive::Check(QByteArray datagram)
{
    int count=datagram.count();
    if(count<14) return false;//4
    ushort cs;
    ushort temp;

    recvPacket.header1=datagram.at(0);
    recvPacket.header2=datagram.at(1);
    recvPacket.destAddressLength=datagram.at(2);
    recvPacket.destAddress=datagram.at(3);
    recvPacket.sourceAddressLength=datagram.at(4);
    recvPacket.sourceAddress=datagram.at(5);
    recvPacket.cmd1=datagram.at(6);
    recvPacket.cmd2=datagram.at(7);
    recvPacket.length=datagram.at(8)+(datagram.at(9)<<8);
    recvPacket.data.clear();
    for(int i=10,k=0;i<count-4;i++,k++)//i
    {
        recvPacket.data[k]=datagram.at(i);
    }
    cs=Crc(datagram.mid(2,count-6));//
    recvPacket.cs=(uchar)datagram.at(count-4)+((uchar)datagram.at(count-3)<<8);
    recvPacket.tail1=datagram.at(count-2);
    recvPacket.tail2=datagram.at(count-1);

    qDebug()<<"recvPacket.cmd1"<<QString::number(recvPacket.cmd1,16)
              <<"recvPacket.cmd2"<<QString::number(recvPacket.cmd2,16)
                <<"recvPacket.length"<<QString::number(recvPacket.length,16)
                  <<"recvPacket.cs"<<QString::number(recvPacket.cs,16)
                    <<"Crc(datagram)"<<QString::number(cs,16)
                    <<"recvPacket.data"<<recvPacket.data.toHex();

    if(sendPacket.cmd1!=recvPacket.cmd1||sendPacket.cmd2!=recvPacket.cmd2) return false;//
    if(recvPacket.header1!=NET_HEADER1) return false;
    if(recvPacket.header2!=NET_HEADER2) return false;
    if(recvPacket.destAddressLength!=NET_ADDRESS_LENGTH) return false;
    //if(recvPacket.destAddress!=NET_ADDRESS_LOCAL) return false;
    if(recvPacket.destAddressLength!=NET_ADDRESS_LENGTH) return false;
    //if(recvPacket.sourceAddress!=NET_ADDRESS_MS) return false;
    if(recvPacket.tail1!=NET_TAIL1) return false;
    if(recvPacket.tail2!=NET_TAIL2) return false;
    if(cs!=recvPacket.cs) return false;

    return true;
}

//ushort  NetSendReceive::Crc(QByteArray datagram)
//{
//    return 0x5555;
//}

unsigned short NetSendReceive::Crc(QByteArray datagram)
{
    const unsigned short g_McRctable_16[256] =
    {
    0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
    0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
    0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
    0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
    0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
    0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
    0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
    0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
    0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
    0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
    0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
    0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
    0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
    0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
    0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
    0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
    0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
    0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
    0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
    0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
    0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
    0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
    0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
    0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
    0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
    0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
    0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
    0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
    };

      unsigned char *pData;
      int nLength;
      unsigned short cRc_16 = 0xFFFF;
      unsigned char temp;

      pData=(unsigned char*)datagram.data();
      nLength=datagram.count();
      while(nLength-- > 0)
      {
        temp = cRc_16 & 0xFF;
        cRc_16 = (cRc_16 >> 8) ^ g_McRctable_16[(temp ^ *pData++) & 0xFF];
      }

      return cRc_16;
}

